×

Method for operating a power tool

  • US 7,336,048 B2
  • Filed: 05/02/2006
  • Issued: 02/26/2008
  • Est. Priority Date: 05/02/2005
  • Status: Active Grant
First Claim
Patent Images

1. A method of operating a power tool with an energy accumulator which supplies power to an electric drive motor, comprising the steps of generating a clock frequency by an electronic unit;

  • with the generated clock frequency;

    switching on a gate of a MOSFET which supplies operating voltage to the drive motor;

    carrying out the switching on of the gate of the MOSFET during a cycle of each pulse of the clock frequency;

    sensing an electric current from the energy accumulator;

    sensing a power loss of an element selected from the group consisting of the energy accumulator, the drive motor, and both;

    sensing a temperature of the energy accumulator;

    sensing an electric voltage of the energy accumulator;

    switching off the MOSFET during the cycle of each pulse of the clock frequency by any of a number of signals depending on different operating parameters which include a maximum permissible electric current, a maximum permissible power loss of the element selected from the group consisting of the energy accumulator, the drive motor, and both, a maximum permissible temperature of the energy accumulator, and a minimum permissible electric voltage.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×